Freddie himself gave us the answer re Mary Austin/Jim/Phoebe etc.

Mariah Carey It’s not the case that if you can’t have sex with somebody then it’s a brother/sister situation. Love can be platonic, soulmates - not always physical.

Gosh... all these speculations about a person you never met , you never knew. Here and there one wonders if the commenter lives in a fantasy world.
Just in case: ( Jackie Smith's reply to someone who couldn't get enough ...)
" Many things bothered Freddie. And Jim admitted his own book would have been one of them ..."